| ichtyo {ade4} | R Documentation |
This data set gives informations between a faunistic array, the total number of sampling points made at each sampling occasion and the year of the sampling occasion.
data(ichtyo)
ichtyo is a list of 3 components.
The value n(i,j) at the ith row and the jth column in tab corresponds
to the number of sampling points of the ith sampling occasion (in eff) that contains the jth species.
Dolédec, S., Chessel, D. and Olivier, J. M. (1995) L'analyse des correspondances décentrée: application aux peuplements ichtyologiques du haut-Rhône. Bulletin Français de la Pêche et de la Pisciculture, 336, 29–40.
data(ichtyo) dudi1 <- dudi.dec(ichtyo$tab, ichtyo$eff, scan = FALSE) s.class(dudi1$li, ichtyo$dat, wt = ichtyo$eff / sum(ichtyo$eff))